R help - Dec 2005 - Help with data.frame and lapply

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Hello:
	I'm having problems with this line of code:

X.lm <- lapply(names(d), function(x) lm(d["cls"] ~ d[x], data=d))

	d[x] is what is giving trouble here, but I don't know exactly how to
solve it. What I'm trying to do is to create a linear model from each
column of the data frame 'd' to apply ANOVA later.
	Thanks very much in advance. Regards:


Juan Daniel L??pez Serna

- ----
Instituto de Ingenier??a del Conocimiento
(http://www.iic.uam.es)
Universidad Aut??noma de Madrid
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> Hello:
> 	I'm having problems with this line of code:
> 
> X.lm <- lapply(names(d), function(x) lm(d["cls"] ~ d[x],
data=d))
> 
> 	d[x] is what is giving trouble here, but I don't know 
> exactly how to solve it. 
How does d look like?
Probably d[,"cls"] and d[,x] instead of d["cls"] and d[x]
solves your problem.
PLEASE do read 
the posting guide! http://www.R-project.org/posting-guide.html
and *give a reproducible example*.

Best,
Matthias
> What I'm trying to do is to create a 
> linear model from each column of the data frame 'd' to apply 
> ANOVA later.
> 	Thanks very much in advance. Regards:
> 
> 
> Juan Daniel L??pez Serna
> 
> - ----
> Instituto de Ingenier??a del Conocimiento
> (http://www.iic.uam.es)
> Universidad Aut??noma de Madrid
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> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list 
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read 
> the posting guide! http://www.R-project.org/posting-guide.html
>

you could use something like:

d <- data.frame(x1 = rnorm(100), x2 = rnorm(100), x3 = rnorm(100), cls 
= rnorm(100))
lapply(d[-match("cls", names(d))], function(x, y) lm(y ~ x), y = 
d$cls)


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm



----- Original Message ----- 
From: "Juan Daniel L??pez Serna" <juanda.lopez at iic.uam.es>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, December 16, 2005 9:33 AM
Subject: [R] Help with data.frame and lapply


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Hash: SHA1

Hello:
I'm having problems with this line of code:

X.lm <- lapply(names(d), function(x) lm(d["cls"] ~ d[x], data=d))

d[x] is what is giving trouble here, but I don't know exactly how to
solve it. What I'm trying to do is to create a linear model from each
column of the data frame 'd' to apply ANOVA later.
Thanks very much in advance. Regards:


Juan Daniel L??pez Serna

- ----
Instituto de Ingenier??a del Conocimiento
(http://www.iic.uam.es)
Universidad Aut??noma de Madrid
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______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html


Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

d <- data.frame(x1 = rnorm(100), x2 = rnorm(100), x3 = rnorm(100), cls = 
rnorm(100))
dd <- subset(d, sel=-cls)
lapply(paste("lm(cls ~", names(dd), ",data=d)"), function(x)
eval(parse(text=x)))


Juan Daniel L??pez Serna a ??crit :
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>
>Hello:
>	I'm having problems with this line of code:
>
>X.lm <- lapply(names(d), function(x) lm(d["cls"] ~ d[x],
data=d))
>
>	d[x] is what is giving trouble here, but I don't know exactly how to
>solve it. What I'm trying to do is to create a linear model from each
>column of the data frame 'd' to apply ANOVA later.
>	Thanks very much in advance. Regards:
>
>
>Juan Daniel L??pez Serna
>
>- ----
>Instituto de Ingenier??a del Conocimiento
>(http://www.iic.uam.es)
>Universidad Aut??noma de Madrid
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>PPB3baK8JNOa3eoIgbmVCdM>=WKlt
>-----END PGP SIGNATURE-----
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>
>  
>